Can't help you on where to find it in your area, but I can tell you if you find straight gas it is going to be 91 octane because like said above they use ethanol to get it up to 93. So if you see 93 than it has ethanol in it.

I have a fuel business in Cincinnati and we are the only one of 2 places who sells straight gas for many years now. Even the marinas on the river are selling ethanol gas around here and they only sell gas on the river for like 3 months during the boating season. We have race gas and straight 91 gas year round at a nice new credit card swiper pump for close to 30 years now. Too bad you don't live around here.